Ordered a battery charger with an adapter for car charger and also American converter. Wrong model arrived but it is in hand to change it. It will be handy to be able to charge a battery while travelling in car. Also should I ever win on Euromillions and go to the States and Canada on a tour it will be useful there too.
Egg on my Face
After messages to and fro from the firm in China I found it WAS the correct model. I was not pushing the battery on to the contacts firmly enough. I feared that my normal ham-handedness would break something. I apolgised to the firm for the trouble I had caused.